attribute vec4 aPosition;
uniform mat4 uTextureMatrix;
attribute vec4 aTextureCoordinate;
varying vec2 vTextureCoord;
void main()
{
    vTextureCoord = aTextureCoordinate.xy;
    //gl_Position = aPosition;
    //解决图像颠倒的问题
    gl_Position = vec4(aPosition.x, -aPosition.y, aPosition.z, 1);
}